Fourier Transform of a productof Green functions

[Physicslad78]

Guys, how do u get the Fourier transform of a product of Greens Functions?I have to get Fourier transform of:

G_{el}(k+q,\tau-\tau1)*G_{el}(k,\tau1) where \tau and \tau1 are two different times (\tau>\tau1) and q is phonon momentum and k is electron momentum...


Thanks

 

[SpectraCat]

*cough* homework problem *cough*

...

*cough* convolution theorem *cough*